(Solved): please help, thank you so much (:  The IUPAC name of \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm ...

The IUPAC name of \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OC}\left(\mathrm{CH}_{3}\right)_{3} \) is: butoxyethane 2-t-butoxyethane 2-ethoxy-2-methylpropane 2-methoxy-2-methylpropane Select the most reasonable formula for the compound with the following mass spectral data: \( M^{+} \)at \( m / z=101 \) with a minor \( M+1 \) peak \[ \mathrm{C}_{5} \mathrm{H}_{6} \mathrm{Cl} \] \[ \begin{array}{l} \mathrm{C}_{9} \mathrm{H}_{12} \mathrm{O} \\ \mathrm{C}_{5} \mathrm{H}_{12} \mathrm{~N}_{2} \end{array} \] \[ \mathrm{C}_{6} \mathrm{H}_{15} \mathrm{~N} \] Predict the major product of the following reaction: 2,2-dimethyloxirane \( +\mathrm{H}^{18} \mathrm{O} / \mathrm{H}_{2}^{18} \mathrm{O} \) (both oxygens are labeled, including the hydroxide ion) \[ \left.\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2}{ }^{(18} \mathrm{OH}\right) \] \[ \begin{array}{l} \left.\left.\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}(\mathrm{OH}) \mathrm{CH}_{2}\right)^{18} \mathrm{OH}\right) \\ \left.\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}^{18} \mathrm{OH}\right) \mathrm{CH}_{2} \mathrm{OH} \end{array} \] \[ \left.\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}^{18} \mathrm{OH}\right) \mathrm{CH}_{2}\left({ }^{18} \mathrm{OH}\right) \]